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starboard is the worst material to use for a backing plate as it has no compressive strength. aluminum is second worst as it corrodes and can not conform to the curved surface. the best is either fiber glass or a plate of 1/4" G 10 that is made to fit the under surface . you then attach it by using thickened epoxy to fill the gaps so the upper and lower surfaces are as parallel to each other as possible. then the bolts will hold easily with regular washers
 
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